Engine.



No. 637,754. Patented Nov. 2|, |899.

M. E. DURMAN. ENGINE.

(Applicatfon me@ Doc. 14, 1898.) (no Modem 2 sham-snm m. 631754.Patented. N0y.. 2|, lass.

M. E. DUBMAN.

l ENGINE. l @pmmon med ngc. 14, 189e.) A 4 (no Model.) A ,i 2sheets-sheet 2.

. F 'yy 2, -A

TM: nofws mens 00. Pumuwa., wAsMmcrmu4 n. c.

UNITED STATES y PATENT flPEEICE.

MIHAELE. DURMAN, OF VOODMRE, MICHIGAN.

ENGINE.

SPECIFICATION forming part of Letters Patent N o. 637,754, datedNovember 21, 1899.

Application filed December 14,1898- Serial No. 699,253. (No model.)

To @A7/Z whom t rit/Ly concer-n:

Be it known that I, MICHAEL E. DURMAN, a citizen of the United States,residing at Woodmere, in the county of Wayne and State of Michigan, haveinvented certain new and useful Improvements in Engines, of which thefollowing is a specification, reference being had therein to theaccompanying drawings.

The invention has referenceto engines of the compound type, and relatesparticularly to an improved valve adapted for use`in that class ofengines and toa novel construction of the supporting-frame for thecylinders.

One of the objects of my invention is to construct a piston valveand'arrange the same within the casin g, or what will be termedhereinafter the valve-chest, in such a man! ner that the pressure of thelive steam within the chest will be extended upon both ends of thepiston and not confined to'one only, whereby the piston instead ofbeing'retarded by the steam moving in one direction will be evenlybalanced.

Another object of my inve'ntionis to provide a simple and effectiveframe to support the engine-cylinders and to construct the frame in suchmanner that while performing the usual function of a support it willalways serve as and constitute the guides for the cylinder cross-heads.

With these objects in view my invention consists in the novelconstruction of an engine, of a frame for -the same, and in t-hepeculiar arrangement and combination of the various parts of the engineand frame, as will be more fully hereinafter shown and described.

In the drawings, Figure l is a perspective view of the engine,illustrating ,the peculiar formation of thef frame, the engine-cylindermounted thereon, and the mechanism for reciprocating the pistons. Fig. 2is a vertical central section through the cylinders and valve-chest,showing the novel construction of piston and the arrangement of thepiston in relation to the cylinders.

A is the high-pressure cylinder, B the lowpressure cylinder, and C thevalve-chest, Which are preferably integrally formed in one casting.These cylinders are supported on a frame comprising four uprightstandards D,

which are secured to lugs or projections E on the cylinder-casting. Thestandards D are secured at their lower ends in a suitable base orbed-plate F, on` which the main engineshaft G is journaled in suitablepillow-blocks I-l. Upon the standards D are adjust-ably securedtheyoke-shaped slides l for the crossheads J. These slides are formed-oftwo parts d b, clamped together around the standards D by the bolts c.The cross-heads J are se cured, respectively, to the piston-rods K ofthe high 'and lowpressu re pistons. They are also connected by theconnecting-rods L to the disk cranks M of the engine-shaft.

N are cross bars or rods secured at their opposite ends to the slidesI.v t.

O is a cross-bar secured to the rods N and forming a bearing for thevalve-rod P. This rodis connected by the connecting-rod Q with therock-arm R on the rock-shaft R', journaled on the base F. R2 is anotherrock-arm on the shaft R', connected by the rod S to the eccentric S onthe engine-shaft Gr..

The pistons in the cylinders A and B may be vof ordinary construction,andthe .pistonrod's pass out through suitable stuffing-boxes in thelower heads of the cylinders.

The valve T is of the type commonly known as piston-valves, andcomprises a body portion d, having three heads or rings e, f, and gformed therein respectively at the two,ends and in the center of thebody and leaving between them the annular spaces or channels i/and i.The body portion of the valve is hollow and is connected by suitablecoupling j with the valve-rod, this coupling being provided with aseries or plurality of perforations or apertures, permitting of freecommunication between the hollow body and the valve-chest below thevalve. This valve controls the ports of both the high and low pressurecylinders, said ports being arranged as follows: 7c is a port leadingfrom the upper end of a high-pressure cylinder to the valve-chest andopening thereinto at a point a short distance below the upper end of thevalve-chest. lis a port similarly connecting the lower end of thehighpressure cylinder` with the valve= chest. m and n are portsrespectively connecting the upper and lower ends of the low-pressurecylinder with the valve-chest and opening IOO thereinto at pointsbetween the openings of` the ports la and Z and upon opposite sides ofthe exhaust-port o.

The parts being constructed and arranged as above described, theoperation is as follows: Live steam is admitted into the valvechestthrough a suitable conduit-pipe U, preferably connected to the upper endof the chest. Supposing the'parts to be in the position shownin F-ig.2of the drawings, the steam in the chest C will be free to pass throughthe port k into the upper end ofthe high-pressure cylinder, and willthus cause the downward movement of the piston in said cylinder. At thesame time the steam which has been pre-l viously admitted in the lowerend of the cylinder is free to pass through the port Z'into the annularchannel t' between the headsf and g.V As lthis channel is also connectedwith the. port n, leading to the lower end of the low-pressure cylinder,the steam'from the lower end'of the high-pressure cylinder will thuspass freely into the lower end of the lowpressure cylinder and acttoiraise the piston therein. Finally, in the position of parts shown inFig. 2 the port fm offers a freeppassage for the steam previouslyadmitted in the upper end of the low-pressure cylinder to the channel hbetween the heads e and fof the Valve and from said channel into theexhaust-passage o, connected therewith. After the piston in thehigh-pressure cylinder has been driven downto the lower end of saidcylinder and the piston in the low-pressure cylinder correspondinglyraised to the upper end the position of the valve will bereversed, thisbeing accomplished by means of the ec-, centric S', rod S, rock-arm R2,rock-shaft R',

Vrock-arm R, connecting-rod Q, and valve-rod P. These parts togetherwill operate to raise the valve into a position where the port Z is infree communication with the live steam in the valve-chest. The ports 7cand m are conand the valve can be readily Y the latter to be morereadily reciprocated than if resistance were formed to'said valve by thesteam. Moreover, the construction of the valve, which permits the resultabove referred to to be obtained,i s exceedingly simple,where by theliability of the disarrangement. and breakage of parts is reduced to aminimum, manufactured at a small cost. d

What I claim as my invention is-- In a compound engine,the combinationwith a base, a pair of vertically-arranged guiderrods ixedl y secured ateach end of the base,

a high-pressure cylinder mounted upon and connecting one pair of rods,alow-pressure cylinder arranged upon and connecting lthe opposite pair ofrods, a Valve-chest intermediate the cylinders and connecting the same,a yokeshaped slide adj ustably secured to each guiderod, each slidebeing formed in two parts, clamped to 'each other and to the rods andarranged in pairs, as" shown, a vertically-reciprocating cross-headengaging eachfpair .of guides, a main drive-shaft mounted upon the base,disk cranks upon said shaft and a connecting-rod between each crank andits respective cross-head.

In testimony whereof I affix my Isignature in presence of two witnesses.

MICHAEL E. DURMAN.

lfVitnesses: f

` M. B. ODoGnER'rY,

H. C. SMITH.

